The improved photocurrent of regioregular poly(3-hexylthiophene) (P3HT) and 6,6-phenyl C61-butyric acid methyl-ester (PCBM) based polymer solar cells (PSCs) using LiF and Al cathode, modified with a reasonable thin Ag layer, was demonstrated. Using an optimal 4nm Ag layer-modified electrode gave 20% improved short-circuit photocurrent density over PSCs with only LiF/Al cathode under AM1. 5G illumination of 100 mW·cm-2. The increased short-circuit photocurrent density is ascribed to plasmon enhancement of the polymer absorption by nanotextured Ag film. The fill factor and open voltage of PSCs using Ag/LiF/Al cathode are decreased compared with the control PSCs with only LiF/Al cathode, which result in the decrease in power conversion efficiency of PSCs modified with Ag film. The possible reason for the deteriorated performance of PSCs with Ag/LiF/Al is stronger carrier recombination at nanotextured Ag.%在P3HT:PCBM聚合物太阳能电池的阴极LiF/Al中引入纳米结构的银膜组成Ag/LiF/Al复合阴极,太阳能电池的光电流能显著提高.在AM1.5G和100 mW·cm-2的模拟太阳光照射下,当银膜厚度为4纳米时,优化的太阳能电池的光电流要比只有LiF/Al的参比太阳能电池高20％以上.研究表明,纳米银膜产生的表面等离子体效应是增强聚合物太阳能电池光电池的主要原因.不过,银膜修饰的太阳能电池填充因子和开路电压要比参考电池低,最终使该类型电池效率降低.在银膜处增加的载流子复合可能是导致电池填充因子、开路电压和能量转化效率降低的重要原因.
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